from flask import render_template, current_app, session, g, abort, request, jsonify

from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.utils.common import user_login_data
from info.utils.response_code import RET
from . import news_blue


@news_blue.route('/followed_user', methods=["POST"])
@user_login_data
def followed_user():
    """关注/取消关注用户"""
    if not g.user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    user_id = request.json.get("user_id")
    action = request.json.get("action")

    if not all([user_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    if action not in ("follow", "unfollow"):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 查询到关注的用户信息
    try:
        target_user = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询数据库失败")

    if not target_user:
        return jsonify(errno=RET.NODATA, errmsg="未查询到用户数据")

    # 根据不同操作做不同逻辑
    if action == "follow":
        if target_user.followers.filter(User.id == g.user.id).count() > 0:
            return jsonify(errno=RET.DATAEXIST, errmsg="当前已关注")
        target_user.followers.append(g.user)
    else:
        if target_user.followers.filter(User.id == g.user.id).count() > 0:
            target_user.followers.remove(g.user)

    # 保存到数据库
    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据保存错误")

    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blue.route("/<int:news_id>")
@user_login_data
def news_detail(news_id):
    """新闻详情
    :param news_id:
    :return:
    """
    user = g.user
    # 右侧新闻排行数据
    # 1. 去数据库查询数据
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)
    # 字典列表
    news_list_li = []
    # 遍历模型对象,将模型对象转换为字典添加到字典列表中
    for news in news_list:
        news_list_li.append(news.to_basic_dict())

    # 去数据库查询新闻信息
    news = None  # type:News
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
    # 如果新闻不存在,报404错误
    if not news:
        abort(404)
    # 更新新闻的点击次数
    news.clicks += 1
    # 判断是否收藏该新闻
    is_collected = False
    # 如果用户已登录
    if user:
        # collection_news后面可以不加all(),因为sqlalchemy会自动加载
        if news in user.collection_news:
            is_collected = True

    # 查询用户评论,显示评论
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news.id).order_by(Comment.create_time.desc())
    except Exception as e:
        current_app.logger(e)
    comment_like_ids = []
    if user:
        try:

            # 需求 查询当前用户在当前新闻里点了哪几个赞
            # 1. 查询当前新闻的所有评论,取出所有评论id
            comment_ids = [comment.id for comment in comments]
            # 2.再查询当前评论中那些评论被用户点赞
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                     CommentLike.user_id == user.id).all()
            # 3.取到所有被点赞的评论id
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        # 代表没有点赞
        comment_dict = comment.to_dict()
        # 默认没有点赞
        comment_dict["is_like"] = False
        if comment.id in comment_like_ids:
            comment_dict["is_like"] = True
        comment_dict_li.append(comment_dict)

    # 当前登录用户是否关注当前新闻作者
    is_followed = False
    # if 当前新闻有作者，并且 当前登录用户已关注过这个用户
    if news.user and user:
        # if user 是否关注过 news.user
        if news.user in user.followed:
            is_followed = True

    data = {
        "user": user.to_dict() if user else None,
        "news_list_li": news_list_li,
        "news": news.to_dict(),
        "is_collected": is_collected,
        "comments": comment_dict_li,
        "is_followed": is_followed

    }
    return render_template("news/detail.html", data=data)


@news_blue.route("/news_collect", methods=["POST"])
@user_login_data
def news_collect():
    """
    收藏与取消收藏
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登陆")

    # 1. 接受参数
    params = request.json
    news_id = params.get("news_id")
    action = params.get("action")

    # 2. 校验参数
    if not all([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    if action not in ["cancel_collect", "collect"]:
        return jsonify(errno=RET.DBERR, errmsg="参数错误")
    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    # 3. 查询新闻,判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询错误")
    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到数据")
    # 4. 收藏  取消收藏

    if action == "collect":
        # news没有在用户的收藏列表里,收藏新闻
        if news not in user.collection_news:
            user.collection_news.append(news)
    else:
        if news in user.collection_news:
            user.collection_news.remove(news)
    # 5. 返回响应
    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg="保存失败")
    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blue.route("/news_comment", methods=["POST"])
@user_login_data
def news_comment():
    """
    新闻评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")
    # 1. 接受参数
    news_id = request.json.get("news_id")
    comment_content = request.json.get("comment")
    parent_id = request.json.get("parent_id")
    # 2. 校验参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DATAERR, errmsg="数据错误")
    # 3. 查询新闻,判断新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询错误")
    if not news:
        return jsonify(errno=RET.NODATA, errmsg="未查询到数据")

    # 4. 初始化评论模型, 并且赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id
    # 5. 添加到数据库
    try:
        db.session.add(comment)
        # 需要手动commit(),因为在return的时候需要用到commit的id
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno=RET.OK, errmsg="OK", data=comment.to_dict())


@news_blue.route("/comment_like", methods=["POST"])
@user_login_data
def comment_like():
    """
    点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")

    # 1. 获取参数
    comment_id = request.json.get("comment_id")
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    if not all([comment_id, news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    if action not in ["add", "remove"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")
    try:
        comment_id = int(comment_id)
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    # 2.
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger(e)
        return jsonify(errno=RET.DBERR, errmsg="数据库查询错误")
    if not comment:
        return jsonify(errno=RET.NODATA, errmsg="没有这条评论")
    if action == "add":
        # 点赞
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        # 如果没有被点赞
        if not comment_like_model:
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            comment.like_count += 1
    else:
        # 取消点赞
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,
                                                      CommentLike.comment_id == comment.id).first()
        if comment_like_model:
            db.session.delete(comment_like_model)
            comment.like_count -= 1
    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="数据库操作失败")
    return jsonify(errno=RET.OK, errmsg="OK")
